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解题方法
1 . 正五角星是一个与黄金分割有着密切联系的优美集合图形,在如图所示的正五角星中,A、B、C、D、E是正五边形的五个顶点,且
,若
,则![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
______ .
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7131d592e355f7745107cbf08a26c314.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/27f79ed6b24371cd7c7f07b72812e702.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/edff1881635893293dd411ead8194aca.png)
![](https://img.xkw.com/dksih/QBM/2022/4/24/2964818012635136/2965849752166400/STEM/f858d6a7-8db1-4122-bee4-0529c5702035.png?resizew=228)
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